In the article, with the help of various models, the thesis on the fundamental nature of the field form of matter in physics is considered. In the first chapter a model of special relativity is constructed, on the basis of which the priority of the massless form of matter is revealed. In the second chapter, a field model of inert and heavy mass is constructed and on this basis the mechanism of inertia and gravity of weighty bodies is revealed. In the third chapter, the example of geons shows the fundamental nature of a massless form of matter on the Planck scale. The three-dimensionality of the observable space is substantiated. In the fourth chapter, we consider a variant of solving the problem of singularities in general relativity using the example of multidimensional spaces. The last chapter examines the author's approach to quantum gravity. The conclusions do not contradict the main thesis of the article on the fundamental nature of the massless form of matter.

For those who do not like formulas in the special of relativity, as aclose illustrative example, let us cite a airplane flying high in the sky. Its dimensions are reduced, and the speed of movement (time process) is slowed down. For passengers of an aircraft, the same phenomena on the earth's surface (for example, moving cars) also look like this. Who flew on an airplane, probably remembers that feeling of unreality when viewed from a high altitude on the tape of an automobile road, where cars moving at high speed seem almost frozen in one place. Time for them seemed to stop. There is an equality between the observer on the earth's surface and the observer in the airplane (mutual "contraction" of lengths and mutual "slowing down" of temporal processes - velocities of motion), similar to how it occurs in the special of relativity. The only difference is that in our example the variable is the relative distance between two observers (geometric relativity), whereas in the special of relativity the variable is the relative speed between the two reference frames (kinematic relativity).